超高韧性水泥基复合材料与活性粉末混凝土界面剪切强度试验研究  

EXPERIMENTAL STUDY ON THE INTERFACIAL SHEAR STRENGTH BETWEEN ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES AND REACTIVE POWDER CONCRETE

作　　者：李庆华[1] 银星 郭康安 徐世烺[1] LI Qing-hua;YIN Xing;GUO Kang-an;XU Shi-lang(Institute of Advanced Engineering Structures,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]浙江大学高性能结构研究所,浙江杭州310058

出　　处：《工程力学》2022年第8期232-244,共13页Engineering Mechanics

基　　金：国家自然科学基金项目(51978607)。

摘　　要：该研究使用双面剪切试验对500 d长龄期的超高韧性水泥基复合材料(UHTCC)、活性粉末混凝土(RPC)和UHTCC/RPC界面的剪切强度进行了测试,并结合数字图像相关技术对其破坏过程进行了观测。结果表明,UHTCC、RPC和UHTCC/RPC界面均表现出良好的剪切延性,在加载过程中均未发生脆性破坏。此外,改进浇筑工艺和提高粘结界面的粗糙度均能够提高UHTCC/RPC界面剪切强度。将现有的界面剪切强度计算经验公式与试验结果对比发现现有的经验公式无法准确预测UHTCC/RPC的界面剪切强度。该研究建立了UHTCC/RPC界面剪切试验的有限元分析模型,并使用COHESIVE单元模拟界面行为,模拟结果与试验结果吻合较好。In this study,the shear strength of 500-day long-age ultra-high toughness cementitious composites(UHTCC),reactive powder concrete(RPC),and the interface of UHTCC/RPC was tested by double-shear test.The failure process was observed by the digital image correlation technique.The results show that the UHTCC,RPC,and the interface of UHTCC/RPC exhibit good shear toughness and no brittle failure during loading.In addition,the improved casting process and increased roughness of the interface can increase the interfacial shear strength of UHTCC/RPC.Comparison of the existing empirical formulas for calculating the interfacial shear strength with the test results revealed that the existing empirical formulas could not predict the interfacial shear strength of UHTCC/RPC accurately.A finite element analysis model of UHTCC/RPC interface shear test was established and the interfacial behavior was modelled by COHESIVE elements.The simulation results were in good agreement with the test results.

关 键 词：超高韧性水泥基复合材料 活性粉末混凝土 界面剪切强度 有限元分析 数字图像相关技术 

分 类 号：TU528.572[建筑科学—建筑技术科学]